Picking shoe for looms



PICKING SHOE'FOR LOQMS Filed April 23, 1951 ATTORNEY A I INVENTOR Z 5 FREDERICK W.AMES 20 m g TH weg Patented Mar. 17, 1953 PICK-ING SHOE FOR LOOMS "Frederick W. Ames, Worcester, Mass., assignor-to Crompton &' Knwles'Loom'Works, Worcester, Mass ya corporation of Massachusetts l App1ication ApriL23, 1951, Serial No. 222,377

'10 Claims. 1

This invention a-relates to improvements in shuttle ipicking mechanisms. for'ilooms and 'it is the-general object of theinvention to provide .an improved form=of picking shoe of 1 the type ordinarily secured to :a ,pickingshaftifor cooperation with a vregularly revolving picking roll or ball. V

In the .past it has been customary to make picking shoes as "a solid casting .or forging having a hub to receive'thepicking'shaft and having a cam integral with the T hub to be engaged by the revolving picking .ro'll.

Because of 'the rigidity of the cam withrespect tothe hub and the picking shaft the roam tends to rebound away from the roll during the first part at. least of thevpicking'operation. and'does not have con- 'tinuous' engagement with the roll. it is an imiportantzobject- -of 'the present invention to (make 'thewpicking'shoe -oftwo rigid or metallic parts, 'one'beinga hub member and the other being a team member, and 'IOOIIIlGCt these parts by an element-made ofresilient material such as rubber or the like -whichgpermits some movement of the cam. relative itowthe hub :to .permit a more nearly "continuous engagement of the roll with i the 'cam throughout the picking operation.

It is "a further'objectof the invention to make the two frigid 'parts :or members of the picking shoe with-pockets or" steps which fit the. rubber 'el'ementiito resist endwise emotion of "the cam "-with re'spect etc .the hub *member to reduce looseriingcofi:thezmetallic. parts from the rubber.

the operation of; picking 1 mechanisms it 1 is occasionally desirable to be able to change the I angle'of -.the:cam1 face with respect to the shaft I on which the picking l shoe is mounted. It is -a further Lobje'ct :ofthepresent invention to 3 mtroduce a res'ilient element-between a: hub I member and acam. member. and connect the two members *by adjusting meanssa such has; screws which can be'usd to efiect'compression of-one -or "the other" ot'the "ends of the?resilientelement 'to" alter "the relation or the: camwithi respect to the hubm'ember. II In thisfeature of v the J invention eachend'of the cam is preferab1yr held to the" picking shaft member by a screw and .if

it is desired to niakethe cam"steepertoxincrease -therocking motion-of the" picking shaft the screw'i'at "the low end ofthe cam will be tightened compress --adjacent parts *of the a resilient element. If on theother hand it -is desired 'to make'the cam-shallower to reduce rocking motion "of'the'picking shaft the screw iat -th high end"of "the 'cam cambe tightened to compress the"upper'endmfthe"resilient ele- :stance is illustrated as associated with apicker .112ltog picknashuttle l3. Thelay is reciprocated three embodiments ment. This feature of "the invention can be utilized whether the resilient element 'is bonded to the'two'members of the shoe or is separate therefrom and held in place partly at least .by the screws.

'In order that'the'invention may be clearly understood referenceis made to the accompanying. drawings which 'illustratejiby way of example of. gthefinvention. and in which:

' Fig. 1 is aside elevationv partly in section of a j' loom "having is the preferred form of picking shoe .applied thereto,

.. Fi -j 2 isv an enlarged vertical" section: on"; line Fig. 3"is-a vertical section' taken .along line s a, Fig; 2, I

'.Fig.'4 is .a view similartoj Fig. 2 butshowing the first modification, of the invention,

i,Fig..'5, is .a vertical section, on line";5'j5, Fig. '4,

} ing the. second modification. of the invention,

t Fig. 7 .isa vertical section on, line'l 'l," Fig. 6, Fig. 8 is adiagrammaticview, similar to 'Fig."'7, butshowing the manner, inwhichthe cam member can" be adjusted to m'ake" it of steeper pitch with respectto. the hub member, and

.Eig" 9 isra viewv simi1ar;to'jIIE-ig.8; but showing -the manner in .whichthe .cam. member is adjustedto, make it of shallower pitch. 1

.Referring to Fig. 1, the loom frame i, sup-- rA pickingushaftflfi rocks in from power arm I0 connected in conventional manner to .a; picker stick, I l- Which-"in the present in- .in usual manner'bythe top;or' crank shaft [4 which rotatesonce fo a hteat 0 v:Except Ionthe; campshoe as will v be set iorth hereinafterithe matter; thusi'far des ri d-is of common construction and ,operates ;in unusual manner.

axial :with and receiving theshaft'fi. I Set screws 20 secure the shoe :Cll'to shafti fiiin adiusted position therealong. .*Hub;. member 18L has exan upwardly ia'cing surface l2 2 which may. curve upwardly and to the right as viewed in Fig. 3. A cam member 25 has a cam surface 25 for engagement with the picking roll 5 and this surface and also the cam member curve upwardly and to the right, see Fig. 3.

Located between the two members [8 and is a resilient element 2'! which in the present instance is a soft elastic material, such as rub ber, bonded directly to the two members 2| and 25. The lower surface 28 of the element 27 is bonded directly to the upwardly facing surface 22 and the upper surface 29 of the element 21 is bonded directly to the under surface of the cam member 25. The bonding of the element 21 to the two members of the picking shoe holds the cam member 25 to the arm 2E. without requiring other means to hold the cam member in position on the arm.

During rotation of shaft 2 in the direction of arrow a, Fig. 1, the roll 25 will first engage the low end 3| of the cam member 25 and will then move along the cam surface 26 to the high part 32 of surface 25, and in doing so will rock the picking shoe Cl and shaft 6 in a counter-clockwise direction as viewed in Fig. 2 to cause the power arm in to give the picker stick il a working or picking stroke.

In the past when the cam has been made rigid with respect to the hub member the first blow of the roll 5 against the low part of the cam has not infrequently caused a slight rebound of the cam away from the roll to be followed by a second engagement between the roll and the cam as the shaft 2 continues to rotate. This intermittent engagement between the roll and the cam surface, or bouncing of the roll along the cam, has resulted in an uneven operation of the picking mechanism, but in the present instance the bouncing or intermittent contacting between the roll and the cam is greatly reduced due to the fact that the resilient element'will be compressed somewhat upon first contact of the cam by the roll and will expand if the cam should tend to move away from the roll. The resilient element therefore acts to maintain the, cam member more nearly in continuous engagement with the roll 25 than has been possible heretofore.

In the first modification shown in Figs. 4 and 5, a picking shoe C2 has a hub member 36 provided with a bore 35 similar to bore l9 and has a lateral arm 35 the upwardly facing surface 3'! of which is made with several pockets 38 four of which are shown in Fig. 5. These pockets preferably have square corners 39 which receive complementarily formed thickened parts 40 of a resilient element 4|. In similar manner, the under surface 42 of the cam member 43 is provided with pockets 44 similar to pockets 58 and receiving thickened parts of the resilient element, as will be apparent from Fig. 5.

The resilient element of the first modification may be bonded to the two members of the cam shoe C2, but because of the thickened parts 45 of the resilient member fitting into pockets 38 and 44 it will not be necessary in all instances to have the resilient element bonded as in the preferred form. If the resilient element 4| is not bonded some means will be required to hold the cam member 43 to the arm 36 and such means are illustrated herein in the form of screws one of which is indicated at adjacent to the low point 5| of the cam surface 52 of the cam member and the other of which is indicated at 53 adjacent to the high point 54 of the cam surface 52. As shown more particularly in Fig. 5 the cam member 43 is provided with a recess 55 for the head 56 of each of these screws. Each head is located below the cam surface 52 to be out of engagement with roll 5. Each screw has a shank 51 which extends through the resilient element and is screw threaded as at 58 into the arm 38. A look nut on each of the screws will hold the latter tightly with respect to the arm 35.

In the'second modification shown in Figs. 6 and 7, picking shoe C3 includes a hub member 64 having a bore 55 for shaft 5. An arm 66 similar to arm 2! extends laterally from hub member 64. A cam element 61 more or less similar to the cam member 25 of the preferred form is provided for the shoe C3 and aresilient element 58 is bonded to the arm '55 and cam member 61 in a manner similar to that already described in connection with the preferred form of the invention. Adjacent to the low point 59 of the cam surface I0 of member 67 is a screw H similar to screw 50, and adjacent to the high point 12 of the surface 75 is a second screw 13 similar toscrew 53 In the two modifications the'resilien't elements by their compression and expansion will behave much in the same manner as that described in connection with the resilient element of the preferred form, but in addition the first and. second modifications provide an additional feature which permits some adjustment of the cam surface which engages the picking roll 5 with respect to the bore of the hub member. This adjustment is shown more particularly in connection with the second modification, but it is to be understood that a similar adjustment is'possible with respect to the first modification.

Referring particularly to Fig. 8, the-full lines show the normal position of the cam member 61 and surface 10 with respect to the hub member when the screws H and 13 are adjusted so as to require little or no compression of the resilient member. If it be desired to increase the power of the picking shoe by making the surface 10 steeper the lower screw H will be tightened to effect some compression of the adjacent end of the resilient element so that the cam surface 10 will take some such position as shown in dotted lines in Fig. 8. By means of adjustments wellknown in the art of picking the roll 5 can be caused to engage the lower end 59 of the surface it when the latter is as shown in dotted lines in Fig. 8, and since this lower end will be at a lower level with respect to the high point 12 than is the case when the resilient element is in normal condition a greater amount of angular motion will be imparted to the picking shoe C3 and V the shaft 5.

If on the other hand it be desired to reduce the amount of rocking of shaft 5 by the roller 5 the lower screw H will be left in its normal position but the upper screw 73 will be tightened to cause the surface 15 to assume some such position as shown in dotted lines in Fig. 9. Under these conditions the high point of the cam will be somewhat lower with respect to the low point than is the case when the resilient member is in its normal undeformed condition. It will be understood that in these adjustments the cam surface will be altered with respect to the axis of the bore of the hub member.

In the first modification the pockets 38 and ts by their reception of the thickened parts 40 of the resilient member will tend to hold the latter and the cam member against a generally horizontal movement relative to the hub member and thereby position the cam member even though the resilient member is not bonded to the arm 36. The adjustment of the cam surface 52 by means of screws 55 and 53 can be effected in the manner similar to that described in connection with the second modification.

From the foregoing it will be seen that the invention sets forth a simple form of picking shoe wherein a resilient element is interposed between the hub and cam members enabling the latter member to move slightly with respect to the hub member during the first part of the engagement of roll 5 with the cam surface to insure a more nearly continuous engagement of the roll with the cam surface. In the first and second modifications means are provided for effecting adjustment of the cam surface with respect to the bore of hub member either to increase or lessen the amount of rocking of the picking shoe and shaft 6 by the roll 5. In the first modification the hub and cam members are provided with pocketc to receive complementarily formed thickened parts the resilient element and because of this construction it is not essential that the resilient element be bonded to the members. Although the bores of the hub members are of rectangular cross-section to fit shaft 6, this is not an essential feature of the invention.

Having now particularly described and ascertained the nature of the invention and in what manner the same is to be performed, what is claimed is:

1. In a picking shoe for loom having a picking shaft, a hub member having a bore for the picking shaft, a cam member extending generally in the direction of the length of the bore, an element of soft elastic material between said members, and adjustable means adjacent each end of the cam member operatively connecting said members, each means capable of effecting compression of the element to vary the position of the cam member with respect to said bore.

2. In a picking shoe for loom having a picking shaft, a hub member having a bore to receive the picking shaft, a cam member extending generally in the direction of the length of said bore, an element of soft elastic material between said members, and screw means adjacent to each end of the cam member operatively connecting the latter member to the hub member, each screw means capable of compressing said element to vary the position of the cam member with respect to said bore.

3. The structure set forth in claim 2 wherein said screw means passes through the element and positions the latter with respect to said members.

4. The structure set forth in claim 2 wherein said element comprises a body of rubber bonded to the members.

5. The structure set forth in claim 2 wherein at least one of said members is formed with pockets and said element has parts thereof extending into the pockets.

6. The structures set forth in claim 2 wherein each member is formed with pockets and the element has portions thereof extending into said pockets.

7. In a picking shoe for loom having a, picking shaft, a hub member having a bore for the picking shaft, a cam member extending generally in the direction of the length of the bore, an element of soft elastic material between said members, and attaching means at one end of the cam member operatively connecting the latter to the hub member and capable of effecting compression of the element to vary the disposition of the cam member with respect to said bore.

8. In a picking shoe for loom having a picking shaft, a hub member having a bore to receive a picking shaft, a cam member, an element of soft elastic material between said members, and means to effect compression of said element in a direction from the cam member toward the hub member to vary the disposition of the cam member with respect to the bore.

9. The structure set forth in claim 8 wherein said means operatively connects the hub and cam members.

10. The structure set forth in claim 8 wherein said means is capable of applying a compressing force to said element at two spaced points therealong and is capable of effecting compression of the element at either of said points.

FREDERICK W. AMES.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

